I don't know about the AD but it's pretty common knowledge
that Atta entered the US from Prague the first instance
we think we Know about.
If he came IN through Prague why this denial of any other
visits there?
There has been a cabal within the CIA who wants to diminish this administration. The CIA has said that Atta couldn't have been in Prague in 4/01 because his cell phone was used here in the states during that time.
He could have easily left his cell with someone else and certainly does not prove he wasn't in Prague.
Czech intelligence has always stood by their reporting that Atta met with an Iraqi government official in 4/01.